More than 800,000 gallons of crude oil leaked into the Kalamazoo River from a broken pipeline near Marshall in July of 2010. It's the biggest oil spill of its kind in U.S. history, but hardly the first for Enbridge Energy.

The National Wildlife Federation points out Enbridge pipelines have been involved in hundreds of leaks since 1999.

“After every spill, they say they will do it better,” says Jeremy Symons, with the National Wildlife Federation, “But their shoddy record, year after year, proves that Enbridge can not be trusted to keep toxic tar sands oil out of our drinking water.”